[Mariner]

3.5x Saturn V?

Is that 3.5x per motor, or 3.5x per rocket?

Do you have a source? Seems a little far fetched.

[Elderberry]

3.5x Saturn V? Is that 3.5x per motor, or 3.5x per rocket? Do you have a source? Seems a little far fetched.

27 Engines per rocket.

http://www.space.com/26025-spacex-falcon-heavy-rocket-explained-infographic.html

[Moonman62]

https://en.wikipedia.org/wiki/ITS_launch_vehicle#Interplanetary_booster

And you can search on Youtube for the video of the raptor engine.